The voltage comparator is one kind of integrated circuit, especially used for contrast two voltages or currents at the comparator two inputs. The main function of this IC is, the comparator has two inputs where it compares the two inputs with each other then generates a differential output like high-level signals or low-level signal. In general, comparators are classified into different types which include electronic, electrical, optical, sigma, mechanical, digital, pneumatic and many more comparators. The comparator circuit, can be designed by using various basic electrical and electronic components  like resistors, operational amplifiers, transistors, diodes, etc. All these comparators are applicable to making electrical and electronic projects.

Features and Electrical Characteristics of LM339

• Four individually operated voltage comparators
• Low noise interference among comparators
• Single Supply Operation: +3.0 V to +36 V
• Dual  Supply Operation: +18V and -18V
• Low Input Bias Current: 25 nA
• Low Input Offset Current: ±5.0 nA
• Low Input Offset Voltage
• Input Common Mode Voltage Range to GND
• Low Output Saturation Voltage: 130 mV @ 4.0 mA
• TTL and CMOS compatible
• ESD Clamps on the inputs increase reliability without affecting device operation
• Pb−Free, Halogen Free/BFR Free and RoHS compliant

Specifications:

• Supply voltage range  : ±18 to 36V
• Differential Input Voltage:±36V
• Differential Input Voltage:-0.3 to +36 V
• Power Dissipation:570mW
• Operating Temperature:0-70°C

Similar to LM339 Voltage Comparators

LM311, LM324, LM397, LM139, LM239, LM2901 etc.

LM339 IC Overview

LM339 is used in applications where a comparison between two voltage signals is required. In addition with four of those comparators on board the device can compare four pairs of voltage signals at a time which comes in handy in some applications. The comparator is popular among makers and engineers for being low cost and good performance. The device response is also fast enough to satisfy many applications.

How to use LM339 Voltage Comparator

First let us consider the internal connection of four comparators in the device as shown below.

Now let us take a single comparator from the four and construct a simple application circuit as show below.

Here the comparison between voltages V1 and V2 is done by the device and an output is provided as Vo. Also the device is powered from single voltage source of VCC as shown above.

In the circuit the comparison output goes as,

If V1>V2 then Vo = VCC

If V2>V1 the Vo = 0V or GND

Based on the state of the output we can determine whether V1 is higher or V2 is higher at the input.

Applications

• Oscillators
• Voltage comparators
• Peak detectors
• Logic voltage translation
• Power supervision
• Industrial
• Measuring instruments
• Automotive

Package Include:

• 1 x LM339N LM339 LM 339 Low Power Low Offset Voltage Quad Comparator IC DIP 14 Pin Package LM339 Quad Differential Comparators IC